Tubingen. The inclusion of renewable energy in heating concept is mandatory for new buildings, including the renovation of existing buildings under certain conditions in Baden-Wuerttemberg. Homeowner must therefore also deal with the economic viability of different solutions.
The promises of installers and manufacturers are large. With the title “solar heating as an investment” for example advertises Timo Leukefeld, director of solar roof Solifer Freiberg GmbH for its solar thermal concepts and expected “yields savings of up to 14 percent as the monetary worth of advantage.” The power Toshiba PA3399U-2BRS course applies only to installations of solar maximum Nutzklasse. These are the big roof-integrated systems, the experts in his company.
The Federation of Consumer Organizations has been somewhat skeptical of profitability calculations of solar thermal systems. In general, solar thermal plant would be a renewed draufgesattelt in the modernization of heating, it is difficult to profitability, says energy consultant Peter kafker, energy adviser to the Federation of Consumer Organizations. “From my experience, at least 80 percent of all solar systems in new construction or will be implemented in conjunction with a boiler Toshiba PA3451U-1BRS replacement. Nearly all manufacturers to achieve improvements and which may be struck not just the solar systems.” Interestingly, in his view there is now little that can ever be expected to rapidly approach the level of energy price increases than small plants with heating facilities.
For a skeptical assessment in terms of profitability is the Stiftung Warentest: In the 2009 durchgerechnete from her model house with oil or gas condensing boilers can be at a heating support system in the course of 25 years 8500 euros to save on fuel costs and electronic Toshiba PA3465U-1BRS. At $ 10,000 plus installation and annual maintenance cost is also funding the profitability weak.
This refers to small plants, so Leukefeld counterargument. He divided the plant into the water Nutzklassen, standard and maximum. This Kategorsierung has now taken over the Saxon Energiegantur Saena in a brochure. The class “water” only produced hot water, the class “standard” has the heating panels 12 square meters and a 750-liter storage. Profitable investments are large Class “maximum”, which installed 24 square panels and a 1000-liter storage and additionally the energy efficiency of existing heating, for example by optimizing the control system would improve the Toshiba PA3107U-1BRS power rate. This includes Leukefeld view of a programmable system. The costs for this are now manageable with 700 to 800 euros and 200 euros for the programming.
As a total cost of such plants indicates Leukefeld 18,000 euros. Euro 2520 is available as a subsidy for the current collectors by the federal government at the basis of the selected area of 24 square meters. Under these conditions, Leukefeld has presented a calculation for a 130-square-meter house it is not suitable for only 17 inch Toshiba PA3331U-1BRS laptop, which is currently heated by a 15 years old low-temperature gas burner. Then savings of 35 percent were possible. Here he goes with his investments from a lifetime of 40 years, plants with lower components had only a significantly shorter life expectancy. Verbraucherschützer kafker can not really understand: “For me it’s not really serious, consider that, for a product of a lifetime of 40 years, simply because there the gum after 25 years of age can be changed. Also, the systems of other vendors do not necessarily fit after 20 years, broken. ”
Leukefeld also makes itself the current debate about the reduction of the feed-in tariff for solar power, and the debate over Toshiba PA3450U-1BRS electricity tariffs for heat pumps take advantage. The Renewable Energy Act could be changed, he says, in the production of solar heating does not play the role. The calculation of return on investments in solar energy for heat production but has a much larger uncertainty: The prediction of energy prices, which are an essential factor for the calculation of savings is like a lottery. Leukefeld submit its calculations based on annual energy price rises of about 7 percent. But that would be a much higher increase than the average of recent years. According to the Federal Ministry for Economic Affairs, the energy costs for heating and hot water in the average household in 1990 were at 43 euros, 2008 at 81 euros.
Arguments in favor of solar thermal energy could in the opinion of Peter kafker but deliver the new version of the Energy Conservation Act. “According to recent calculations by EnEV 2009 to get the EnEV evidence alone, with an improved condensing boilers to no longer good. The required attenuation increased cost much more than the solar option. Wärmepumpen tariffs were increased by nearly 25 percent in some places. This would legislate many builders into solar persuaded. ” One uncertainty, however, the subsidies for solar thermal systems is the large building not the Toshiba PA3534U-1BRS. Financed through the market incentive program. The Budgets have already decided on a cap and further funds are under budget proviso. pgl